643605055520 has 48 divisors (see below), whose sum is σ = 1737733652928. Its totient is φ = 220664590080.

The previous prime is 643605055507. The next prime is 643605055559. The reversal of 643605055520 is 25550506346.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287322566 + ... + 287324805.

It is an arithmetic number, because the mean of its divisors is an integer number (36202784436).

Almost surely, 2^643605055520 is an apocalyptic number.

It is an amenable number.

643605055520 is an abundant number, since it is smaller than the sum of its proper divisors (1094128597408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643605055520 is a wasteful number, since it uses less digits than its factorization.

643605055520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574647393 (or 574647385 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 41.

The spelling of 643605055520 in words is "six hundred forty-three billion, six hundred five million, fifty-five thousand, five hundred twenty".